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Febco 765 leaking when using compressor for winterization

When I attach compressor to hose bib between water supply and Febco 765 unit, it leaks air preventing me from blowing out all zones. How can I prevent this? I have no blow out attachment after Febco unit.

Would using the test cock to blow out help. If so, would I use the upper or lower test cock.

Same issue with the Febco 765

Hi
I have the same issue and regardless of what I do, I have taken the bell off and taken the poppet etc out and I cannot see any damage
I have the water out of the basement (turned off) coming into a draining cock (think outdoor hose) then up into the Febco then down into the zones. I have the a/c attached to the draining cock and have also tried spigot 1 and 2 on the Febco
I have a 4gallon A/Comp and regardless of what pressure (20psi to 50), the Febco makes this Buzzing noise and air leaks out and nothing with the zones.
When I initially attached it its started to blow out the open zone I had on then it stopped and thats when the buzzing started. Closed all zones and started again but nothing just the buzzing
Have I destroyed the contents or have I missed something